linux-kernel - Re: linux-next: build failure after merge of the pm tree

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Message-ID: <c0514f1376171e0998ce2e8b74be21a064b00406.camel@intel.com>
Date:   Thu, 28 Apr 2022 11:07:20 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the pm tree

This is caused by the new merged commit 39c184a6a9a7 ("intel_idle: Fix
the 'preferred_cstates' module parameter"), which removes the variable
and function that commit cc6e234b8264 ("intel_idle: Add AlderLake
support") depends on.

I will send a patch on top to fix this soon.

thanks,
rui

On Thu, 2022-04-28 at 11:00 +1000, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the pm tree, today's linux-next build (x86_64
> allmodconfig)
> failed like this:
> 
> drivers/idle/intel_idle.c: In function 'adl_idle_state_table_update':
> drivers/idle/intel_idle.c:1701:17: error: 'disable_promotion_to_c1e'
> undeclared (first use in this function)
>  1701 |                 disable_promotion_to_c1e = true;
>       |                 ^~~~~~~~~~~~~~~~~~~~~~~~
> drivers/idle/intel_idle.c:1701:17: note: each undeclared identifier
> is reported only once for each function it appears in
> drivers/idle/intel_idle.c:1706:9: error: implicit declaration of
> function 'c1e_promotion_enable' [-Werror=implicit-function-
> declaration]
>  1706 |         c1e_promotion_enable();
>       |         ^~~~~~~~~~~~~~~~~~~~
> drivers/idle/intel_idle.c: At top level:
> drivers/idle/intel_idle.c:1854:13: error: conflicting types for
> 'c1e_promotion_enable'; have 'void(void)' [-Werror]
>  1854 | static void c1e_promotion_enable(void)
>       |             ^~~~~~~~~~~~~~~~~~~~
> drivers/idle/intel_idle.c:1854:13: error: static declaration of
> 'c1e_promotion_enable' follows non-static declaration
> drivers/idle/intel_idle.c:1706:9: note: previous implicit declaration
> of 'c1e_promotion_enable' with type 'void(void)'
>  1706 |         c1e_promotion_enable();
>       |         ^~~~~~~~~~~~~~~~~~~~
> 
> Caused by commit
> 
>   39c184a6a9a7 ("intel_idle: Fix the 'preferred_cstates' module
> parameter")
> 
> interacting with commit
> 
>   cc6e234b8264 ("intel_idle: Add AlderLake support")
> 
> Presumably this should have been fixed up in commit
> 
>   55ecda6f25ef ("Merge branch 'intel-idle' into linux-next")
> 
> I have used the pm tree from next-20220427 for today.
>